Dynamo-electric machine.



H. V. NYE.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED uov. 9. 1910.

7 0 0 max) 1n: :loRRls pz-rsns ca., WASHIRGYON, n. c

UNITED STATES PATEN OFFICE.

HENRY V. NYE, OF WEST ALLIS, WISCONSIN, ASSIGNOR, BY MESNE ASSIGNMENTS,TO ALLIS-CHALMERS MANUFACTURING COMPANY, A CORPORATION OF DELAWARE.

DYNAMO-ELECTRIC MACHINE.

Specification of Letters Patent.

Patented Dec. 26, 1916.

rected to the flcooling of dynamo-electric machines.

In dynamo-electric machines, especially 'motors which vary in speed, itis often difiicult to obtain sufiicient ventilation with the low speedsbecause ventilation varies with the speed. Thus it often happens thatmachines which keep sufiiciently cool at the high speeds, heat upexcessively at the lower speeds because of the diminished ventilatinefiect.

he object of this invention is to provide novel and useful means formaintaining dynamo-electric machines cool, said means being of simpleand durable construction, and reliable under all conditions ofoperation. I

The various novel features of the invention will be described in thespecification and particularly set forth in the appended claims.

This invention is illustrated in the accompanying sheet of drawings inwhich Figure l is a longitudinal elevation, partly in section, of adynamo-electric machine equipped with my invention; Fig. 2 is a sideelevation of the same showin one method by which a fan or ventilator isactuated; Fig. 3 is a longitudinal elevation, partially in section, of amodification of that shown in Figs. 1 and 2; and Fig. 4c is adiagrammatic view showing the electrical connections of the main motorand of the motor for driving the ventilator.

Mounted upon the shaft 10 and secured thereto is a spider 11, upon whichis mounted a laminated core 12. This laminated core is made up of groupsof laminae, which are spaced relatively to each other to formcircumferential ventilating passageways 13 arranged axially of themachine. The laminated core is held securely in position by end heads 14and 15, which are drawn toward each other by bolts 16. The core isprovided with slots for the reception of coils 17, which are connectedto a commutator 18 by commutator leads 19. The end turns 20 and endconnectors 21 of the winding are supported and retained in position inany suitable manner. supported by an annular member 35, which 'issecured to flanges 22 formed integrally The commutator 18 is with ribs23 of the end head 14. The whole interior of the rotor is a skeletonstructure having large open ventilating spaces and passageways. I

In order to maintain the machine cool under all conditions of operation,cooling means comprising a rotary fan 24: loosely mounted on the shaft10 has been provided. This fan is made up of bladin 25 secured to ashroud ring 26 and anot er annular member 27, which is adapted to rotateon Babbitt metal 28 formed on and secured by nuts 37 tothe shaft 10.This annular member 27 w is provided with a grooved portion 29 for thereception of a belt 30, which is connected to a motor 31 for driving thefan. The fan is rotatably mounted on the shaft of the dynamo-electricmachine to be kept cool, and its speed of rotation is independent of anymotion of the shaft 10 or rotor of the machine.

When the motor 31 is in operation the fan 2a is rotated upon the shaft10, the fan drawing in air from the outside of the machine and forcingit through the various ventilating passageways 32, 33, 34:, and 13 asindicated by the arrows. By means of this arrangement the differentparts of the rotating structure and also the stator structure, only thepart 36 of which is here shown, are thus ventilated and kept cool.

Under ordinary high speed operating conditions the rotor with fansarranged in some common way would ventilate the machine sufiiciently,but where the machine is one of variable speed and the ventilationdepend ing directly upon the speed of the machine, it is readilyapparent that at times the ventilation would not be great enough tomaintain the machine in an efiicient and safe operating condition. Bymeans of the arrangement here shown with a fan rotatably mounted on theshaft of the dynamo-electric machine to be cooled and rotatableindependently thereof by a motor 31, any degree of ventilation can beobtained and maintained under all conditions of operation.

Instead of having the ventilating fan belted to and driven by a smallmotor a. few feet away from the machine to be cooled, the ventilator orfan can be rotatably mounted on the main motor shaft as before but havethe fan direct connected to the armature of a small auxiliary motor alsorotatably mounted on the main motor shaft of the machine to be cooled,In other words, the armature of the auxiliary motor and the fan can betaken as a unit and slipped onto the main motor shaft. In this case thearmature and the fan directly connected thereto can be rotatedindependently of the main motor-shaft. The main motor could be at astandstill and at the same time the auxiliary motor and fan could berotating on the main ,motor shaft at any desired rate of speed.

As here shown the armature 40 and fan 41 are mounted as a unit on asleeve 42, which is mounted on and adapted to rotate independently ofthe movement of the ,main motor shaft ,43, upon which is adapted to besecured thearmature of the machine to be cooled.v This auxiliary notoris provided with the usual commutator- 44 and I field structure 45, thelatter of which is supported by one of-themain motor bearings 46., Thearmatureofthe auxiliary motor is prevented from sliding off the motorshaft by a nut 47, which engages a threaded portion of said shaft. I

This ventilating arrangement is illus- .35ltrated in connection with amain motor which hasa variable speed, but the invention is not limitedto this type of a machine as the invention can be applied to a constantspeed machine equally as well. The invention=can further be used inconnection with different kinds, types, and classes of translatingdevices. The small fan-driving motors illustrated here can have theirspeeds varied to meet the ventilating requirements. In the diagram inFig. 4 the main motor 48 and auxiliary motor 49 areconnected across thesame supply mains 50 and 51, but the auxiliary motor is provided with arheostat 52 so that the speed of the auxiliary motor can be variedindependently of the speed of the main motor.

It is evident that other arrangements can be made, also that there maybe many modific'ations of the precise form here. shown and described,and I aim in my claims to cover all such modifications which do notinvolve a departure from the spirit and scope ofmy invention.

What I claim as new is: v p v 1. In combination, a dynamo-electricmachine having a. Shaft-and an overhanging commutator, and a unitcomprising another dynamo-electric -machine and. a fan .con-

nected thereto, the rotatable elemjentofsaid unit being mounted on andindependently rotatable about said shaft withinsaid-ioverh g c mu ato r.Q inasa dfi y nE -e s ci naahin a: yn r ectriqu ihi s nd r gthere or,iherpt tin -n r o said machine beingisecured on; said: shaft, an electricmotor, the rotor ofl-whichis-mounted to rotate relatively tosaidshafgjand aventilating fan mounted onx the rotor of said motor, thestator of said motor being supported by said bearing and-said motor andfan being disposed beneath a. projecting part of said rotating part. p j

Milwaukee, W is, Nov. 4, 1910.

In testimony whereof I aifix my signature, in the presence of twowitnesses.

HENRY V. NYE.

Witnesses CHAS. L. BYRON, TEKLA BAST.

Copies of this patent may lie-obtained for five cents each, byaddressing the Commissioner of Patents,

' Washington, D. C.

